<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
          margin: 0px;  
          padding: 0px;
        }
        #de1{
            background-color: aqua;
            
        }
        #de2{
            background-color: red;
            
        }
        #de3{
            background-color: blanchedalmond;
            
        }
        .item{
            width: 100px;
            height: 100px;
        }
        #father{
            display: flex;
            flex-flow: row wrap;
            height: 500px;
            background-color: aquamarine;
            /* justify-content: center; */
            /* justify-content: space-between; */
            /* justify-content: space-around; */
            /* justify-content: space-evenly; */
            /* align-items: stretch; */
            align-items: center;
            justify-content: center ;
        }
    </style>
</head>
<body>
    <div id="father">
    <div id="de1" class="item">
        1
    </div>
    <div id="de2" class="item">
        2
    </div>
    <div id="de3" class="item">3
    </div>
    
   
    </div>
</body>
</html>